It's not perfect (it's actually pretty racist... but let's not go into that here), but it's very versatile!
Some faces get better results than others though. Those with very distinctive mouth shapes, for instance... :( Don't really come across well.
Can you tell who these toons are based on? >.>
So far I've only made females! But I think I'm going to try some males next!
It's also made me realise that many of our celebrity faces are really... well... uniform and average. OTOH we are sort of trained to find 'average' faces attractive, so that's not that surprising!